Engine Controls - Tests W/O Codes: Introduction
Before diagnosing symptoms or intermittent faults, perform steps in articles listed below:
Use this article to diagnose driveability problems existing when a hard fault code is not present.
NOTE:
Some driveability problems may have been corrected by manufacturer with a revised computer control module. Check with manufacturer for latest computer application.
Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component, system test or adjustment.
Use intermittent test procedures to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.
NOTE:
For testing procedures, see SYSTEM/COMPONENT TESTS
article. For specifications, see articles listed below: